Not only the flag but also the close reason is _utterly useless_ by itself. If you cannot be bothered to leave a comment explaining why you think the question is unclear or which further details are needed, do not vote or flag, period. You _must_ clarify yourself what is missing. Maybe more implicit knowledge must be made explicit. Maybe you misunderstood.

If you do not spell it out, the question will at least receive a canned comment leading precisely nowhere, or, worse, remain closed forever. Others cannot look inside your head, they do not know what’s wrong/missing.

Thank you.

Recent examples (not closed, but voted on)

 * https://superuser.com/q/1768968
 * https://superuser.com/q/1769270
 * https://superuser.com/q/1768616